Addiction and neural ageing
Addiction and neural ageing

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Glossary


Glossary for SD805_2
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P

pinocytosis

Endocytosis of liquid.


pituitary gland

A hormone-producing gland situated at the base of the brain.


placebo

A neutral substance that can none-the-less have a specific effect, especially if a subject believes that it will do so, e.g. to reduce pain.


plasticity

(neuronal) A property of neurons whereby the connection between a neuron and a target is neither specified nor fixed; confers the ability of neurons to change their connections.


polar covalent bond

Covalent bond in which there is substantial charge separation; occurs when the combining atoms have different electronegativities.


political economy

This approach to analysing society is concerned with the unequal distribution of wealth.


pollution

The introduction into the environment (air, water or land) of contaminants, the quantities, characteristics and duration of which are likely to be injurious to humans, animal, or plant life.


polymer

A large molecule formed by the linking together of many small-molecule ‘building blocks’ (called monomers).


polypeptide

A chain of amino acids joined together by peptide bonds. A protein is made up of one or more polypeptide chains held together by weak, non-covalent interactions.


positive feedback

A process in which a deviation from some condition tends to promote further deviation.



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